height, weight = eval(input("请输入身高（米）和体重（公斤）【逗号隔开】："))
bmi = weight / pow(height, 2)
print("BMI数值为：{:.2f}".format(bmi))
who = ""
if bmi < 18.5:
    who = "过轻"
elif 18.5 <= bmi <25:
    who= "正常"
elif 25 <= bmi <28:
    who = "过重"
elif 28 <= bmi <32:
    who = "肥胖"
else:
    who="严重肥胖"
print("BMI指标为：{0}".format(who))